  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include<stdio.h>

  int main(void)
  {
    int open_file;
    open_file = open("abc", O_CREAT, 0777);
    printf("open_file = %d\n", open_file);
  
    close("abc");
    return 0;
  }
